#include <boost/thread.hpp>    
#include <iostream>    
  
void wait(int seconds)   
{   
  boost::this_thread::sleep(boost::posix_time::seconds(seconds));   
}   
  
boost::mutex mutex;   
  
void thread()   
{   
  for (int i = 0; i < 5; ++i)   
  {   
    wait(1);   
    //mutex.lock();   
    std::cout << "Thread " << boost::this_thread::get_id() << ": " << i << std::endl;   
   // mutex.unlock();   
  }   
}   
  
int main()   
{   
  boost::thread t1(thread);   
  boost::thread t2(thread);   
  t1.join();   
  t2.join();   
}   

